stilpnomelane

== English == === Etymology === Ancient Greek στιλπνός (stilpnós, “glittering”), and μελανός (melanós, “black”). === Noun === stilpnomelane (countable and uncountable, plural stilpnomelanes) (mineralogy) A metamorphic phyllosilicate mineral of the mica group, having the chemical formula K(Fe2+,Mg,Fe3+)8(Si,Al)12(O,OH)27. === Further reading === David Barthelmy (1997–2026), “Stilpnomelane”, in Webmineral Mineralogy Database. “stilpnomelane”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.